Other things have Cannabinoids in them, but in low doses. https://www.yahoo.com/video/cannabinoids-without-cannabis-yes-everyday-184410155.html

Weed grown indoors is where you get all the pretty pictures. The plant is grown under near perfect conditions. Temp, nutrients, watering, number of plants in a room, light, etc. So many factors that just one going down could turn your plant into one that's loaded with seeds or just stunts it's growth. Outdoor plants look more "natural" and are usually used for THC extracts. Like oils and topicals.